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@aufbruch
I think you'd struggle to heat all edges of a circle evenly enough, as well as being able to effectively heat the inside edges of the pipe. You'd then have trouble clamping it evenly.
Maybe take a sheet of say 8mm, use a hole saw to cut out discs to the same outside diameter of the pipe (normally 50mm or 60mm ?). Then use a forstner of say 44mm or 54mm to drill halfway through the disc so you create a sidewall on the cap.
Then you have two flat edges which can be easily faced/cleaned and (if you were feeling professional) could be heated with something like this: http://www.plasticweldingequipment.co.uk/butt-fusion-plastic-pipe-welding-plates-pr-16184.html